It's got the look: The effect of friendly and aggressive facial expressions on product liking and sales
Landwehr, McGill and Herrmann, Journal of Marketing 75(3), 2011, 132-146. Four studies, three on cars and one on mobile phones. Friendliness was conveyed mainly by the grille and aggressiveness mainly by the headlights; consumers preferred an upturned grille with slanted headlights; the preference was linked to positive affect (pleasure and arousal) and validated against automobile sales data. Sample sizes and sales specifics not stated at this depth.
Landwehr, McGill and Herrmann, Journal of Marketing 75(3), 2011, 132-146. Four studies, three on cars and one on mobile phones. Friendliness was conveyed mainly by the grille and aggressiveness mainly by the headlights; consumers preferred an upturned grille with slanted headlights; the preference was linked to positive affect (pleasure and arousal) and validated against automobile sales data. Sample sizes and sales specifics not stated at this depth.
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Landwehr, J. R., McGill, A. L., & Herrmann, A. (2011). It's got the look: The effect of friendly and aggressive facial expressions on product liking and sales. Journal of Marketing, 75(3), 132-146. doi:10.1509/jmkg.75.3.132 https://doi.org/10.1509/jmkg.75.3.132